Nondisjunction refers to the failure of pairs of chromosomes or sister chromatids to separate during meiosis or mitosis.
What is the term for an error in which homologous chromosomes fail to separate during meiosis or mitosis?
Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate properly during cell division. … Nondisjunction results in daughter cells with abnormal chromosome numbers (aneuploidy).
When homologous chromosomes fail to separate during meiosis Which of the following occurs?
Nondisjunction in Meiosis: Nondisjunction occurs when homologous chromosomes or sister chromatids fail to separate during meiosis, resulting in an abnormal chromosome number.
What term refers to the failure of homologous chromosomes to separate during meiosis I quizlet?
Nondisjunction is the failure of homologous chromosomes to separate during meiosis I, or the failure of sister chromatids to separate during meiosis II or mitosis. … Define: One of a pair of chromosomes with similar genetic information and from different sources like the sperm and egg.
Is the failure of replicated chromosomes to separate during meiosis?
Nondisjunction is the failure of replicated chromosomes to separate properly during meiosis. This may result in genetic disorders caused by abnormal numbers of chromosomes.
When sections of chromosomes are lost it is called a?
segment is lost; or by translocation, when a segment changes from one location to another in the same or a different chromosome. These are the processes by which chromosomes evolve.
What is the result of nondisjunction?
Nondisjunction in meiosis can result in pregnancy loss or birth of a child with an extra chromosome in all cells, whereas nondisjunction in mitosis will result in mosaicism with two or more cell lines. Aneuploidy may also result from anaphase lag.
What chromosome is affected in Klinefelter syndrome?
Klinefelter syndrome (sometimes called Klinefelter’s, KS or XXY) is where boys and men are born with an extra X chromosome.
What is illustrated Figure 14 7 quizlet?
What is illustrated in Figure 14-7? have some normal hemoglobin in their red blood cells. … The pedigree chart in Figure 14-10 shows that some people can be carriers of the trait without being afflicted.
When chromosomes fail to separate correctly during anaphase of meiosis what can occur quizlet?
If nondisjunction occurs during anaphase of meiosis II (Figure 8.22b), the net result is two abnormal and two normal haploid cells. If a gamete carrying an extra chromosome unites with a normal gamete, the offspring will be trisomic.